Support browser events for unhandled rejection tracking

[sindresorhus]

The naming of the events are slightly different, but should have same behavior.

https://googlechrome.github.io/samples/promise-rejection-events/index.html

I know pinkie is meant for Node.js, but people will still Browserify Node.js stuff that use it.

[ysmood]

@sindresorhus Maybe you can give Yaku a try.

[jamestalmage]

How should we handle the console output?

Chrome currently outputs a nice message that shows the rejected promise:

And then updates when it is later fulfilled:

(Note how the x changes to a check).

I have played with using window.dispatchEvent and it doesn't seem to output anything to the console. It only seems to work with native promises.

I am not sure we should be printing to the console at all, but doing so would better follow the native implementation.